Individual Herbs Notebook

Dou Ban Cai

Pharmaceutical: Herba Nasturtii
Taxonomy: Nasturtium Officinale

Other names: Watercress

Category: Herbs that Clear Heat



Properties: Pungent, Slightly Bitter, Cool

Meridans Entered:
Primary: Spleen, Lung, Stomach, Intestines


Traditional Actions/Indications:
  1. Clears Lung Heat
    Lung heat dry cough
  2. Cools the Blood and resolves Toxicity
    Scurvy, painful swelling from clove sore
    Itchy skin
  3. Promotes urination
    Infection of urinary system

Suggested Daily Dosage: Eaten fresh as food or pounded and applied externally.


Cautions: Caution over-eating if taking anticoagulant medication.


Notable Constituents:
  1. Ascorbic Acic
    Watercress contains up to 43mg/100g of vitamin C, which is 71% RDI, explaining its action on scurvy. Vitamin C is a potent reducing and antioxidant agent with functions in fighting bacterial infections, detoxifying reactions, iron absorption and the formation of collagen in fibrous tissue, teeth, bones, connective tissue, skin, and capillaries. It cannot be produced or stored by humans and must be obtained in the diet.
  2. Retinol
    Watercress contains up to 63% RDI per 100g of Vitamin A which plays an essential role in metabolic functioning of the retina, the growth of and differentiation of epithelial tissue, the growth of bone, reproduction, and the immune response
  3. Phylloquinone
    Watercress is also high in Vitamin K, necessary for posttranslational modification of certain proteins, mostly required for blood coagulation. It is also an antidote for coumatetralyl, a coumarin used as rat poison, of the same family as warfarin. It is therefore recommended to avoid high levels of Vitamin K if taking warfarin.

Does not appear in any formulae listed on this site
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